Badger Air-Brush Co. #51-042 QD Coupler. The QD coupler enables the conversion of any standard Badger air hose into a quick disconnect hose. (Includes 51-038 Badger Male QD). The addition of the QD coupler and male quick disconnect to the airbrush, makes airbrush changes a snap. A quick disconnect system saves time and increases efficiency to any production finishing process. A must for multi-airbrush users utilizing a standard Badger airbrush hose (with hose adaptors for varying brands) and threading one airbrush off and the next airbrush on when changing airbrushes. Badger Air-Brush Co. produces quick disconnects for all major airbrush brands, making the QD coupler a usable accessory with most airbrushes.